The Chamberlock is the room at the end of each Test Chamber that contains an elevator leading to the next one. The Chamberlock is the most common fixed-end goal of any test chamber, and its entrance is always covered by a Material Emancipation Grill to vaporize any unauthorized objects that pass through and remove any previously-placed portals. Chamberlocks appear in most levels of both Portal and Portal 2.
The Chamberlock as it appears in Portal 2.
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Excellent. Please proceed into the chamberlock after completing each test.
